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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-06-09 23:12:00 +0200
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-06-15 05:26:17 +0200
commit177996e6e20f15004d6757d9b859f57d181ef443 (patch)
treec5940dd81e7ba4e571d7804a574d73a47e8bef5f /arch/powerpc/kernel/time.c
parentpowerpc/install: Bail with error code on error in install script (diff)
downloadlinux-177996e6e20f15004d6757d9b859f57d181ef443.tar.xz
linux-177996e6e20f15004d6757d9b859f57d181ef443.zip
powerpc: Don't do generic calibrate_delay()
Currently we are wasting time calling the generic calibrate_delay() function. We don't need it since our implementation of __delay() is based on the CPU timebase. So instead, we use our own small implementation that initializes loops_per_jiffy to something sensible to make the few users like spinlock debug be happy Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to '')
-rw-r--r--arch/powerpc/kernel/time.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index bee1443da763..15391c2ab013 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -52,6 +52,7 @@
#include <linux/jiffies.h>
#include <linux/posix-timers.h>
#include <linux/irq.h>
+#include <linux/delay.h>
#include <asm/io.h>
#include <asm/processor.h>
@@ -1143,6 +1144,15 @@ void div128_by_32(u64 dividend_high, u64 dividend_low,
}
+/* We don't need to calibrate delay, we use the CPU timebase for that */
+void calibrate_delay(void)
+{
+ /* Some generic code (such as spinlock debug) use loops_per_jiffy
+ * as the number of __delay(1) in a jiffy, so make it so
+ */
+ loops_per_jiffy = tb_ticks_per_jiffy;
+}
+
static int __init rtc_init(void)
{
struct platform_device *pdev;